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We examine two successive flare eruptions (X5.4 and X1.3) on 2012 March 7 inthe NOAA active region 11429 and investigate the magnetic field reconfigurationassociated with the two eruptions. Using an advanced non-linear force-freefield (NLFFF) extrapolation method based on the SDO/HMI vector magnetograms, weobtain a stepwise decrease in the magnetic free energy during the eruptions,which is roughly 20%-30% of the energy of the pre-flare phase. We alsocalculate the magnetic helicity, and suggest that the changes of the sign ofthe helicity injection rate might be associated with the eruptions. Through theinvestigation of the magnetic field evolution, we find that the appearance ofthe "implosion" phenomenon has a strong relationship with the occurrence of thefirst X-class flare. Meanwhile, the magnetic field changes of the successiveeruptions with implosion and without implosion were well observed.

Magnetic Field Restructuring Associated with Two Successive Solar Eruptions